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ACS Sens. 2017 Aug 25;2(8):1167-1174. doi: 10.1021/acssensors.7b00289. Epub 2017 Aug 9.

An Easy to Manufacture Micro Gas Preconcentrator for Chemical Sensing Applications.

Author information

1
Department of Internal Medicine, Division of Pulmonary and Critical Care Medicine, University of California, Davis , Sacramento, California 95617, United States.

Abstract

We have developed a simple-to-manufacture microfabricated gas preconcentrator for MEMS-based chemical sensing applications. Cavities and microfluidic channels were created using a wet etch process with hydrofluoric acid, portions of which can be performed outside of a cleanroom, instead of the more common deep reactive ion etch process. The integrated heater and resistance temperature detectors (RTDs) were created with a photolithography-free technique enabled by laser etching. With only 28 V DC (0.1 A), a maximum heating rate of 17.6 °C/s was observed. Adsorption and desorption flow parameters were optimized to be 90 SCCM and 25 SCCM, respectively, for a multicomponent gas mixture. Under testing conditions using Tenax TA sorbent, the device was capable of measuring analytes down to 22 ppb with only a 2 min sample loading time using a gas chromatograph with a flame ionization detector. Two separate devices were compared by measuring the same chemical mixture; both devices yielded similar peak areas and widths (fwhm: 0.032-0.033 min), suggesting reproducibility between devices.

KEYWORDS:

chemical sensor; detectors; gas preconcentrator; microelectromechanical systems (MEMS); sorbent

PMID:
28753000
DOI:
10.1021/acssensors.7b00289

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